If you've been running Microsoft Security Essentials as your antivirus, you should absolutely replace it. MS has so much as said they plan their AV to be a bare minimum and not much else. When it was new, it was testing very well but has been slipping consistently. I used to be an advocate of…
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Scientists create malware that communicates using sound, no network required
Kind of scary but this is only proof of concept (meaning possible but not currently happening). Worth noting a max range of ~19m but verrrry slow transmission speed (but a username+ password+ bankname would be verrry little data to send). http://www.engadget.com/2013/12/03/audio-malware/
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